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07-12-2017
Mathematics

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A Chemist has 100g of 25% acid solution. How much of these solution he needs to drain and replace with 70% acid solution to obtain 100g of 60% acid solution?

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Kalahira Kalahira

17-12-2017

let us assume x=amt of 25% solution to drain and replace with 70% solution 25%

25%(100-x)+70%x=60%100

25-.25x+.70x=60

.50x=35

x=70

so he needs to drain and replace 70 mg of these solution to obtain 100g of 60% acid solution.

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